Solu-Medrol and would greatly appreciate

I don't know if this is related to recent S-M IV of 1GM/day x 3 days + extended graduated taper off with prednisone.
There is excruciating pain in legs, more left side than right but both. Every atom, waist to toes hurts on maximum volume, in surges and dips of indescribable pain, for hours and hours. Usually back to normal, daily pain level of raw skin with sunburn on waking after so so sleep of 4-5 hours daily.
I have chronic, secondary progressive MS of 14 years. Ambulatory with walker and cane. Also exposed to Agent Orange in heavily sprayed areas of I Corps, Vietnam, 1968-69. I have 100% service connected, permanent and total, combat related PTSD rating.
I am on Methdone and Percocet 3 months, and just started Lorazipam. M&P do not work at prescribed dosages. Yesterday I took 8 10mg Methadone pills and 6-7 5mg Percocet tabs, and it was inadequately bearable, and I barely made it out alive, again.
I'm going to the VA soon to see what they say, but I would greatly appreciate any advice some nice, knowledgable person may take the time to give.
Thank you